import pytest
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from main import app, get_db
from models import Base

TEST_DB = "sqlite:///./test.db"
test_engine = create_engine(TEST_DB, connect_args={"check_same_thread": False})
TestSession = sessionmaker(autocommit=False, autoflush=False, bind=test_engine)
Base.metadata.create_all(bind=test_engine)

def override_get_db():
    db = TestSession()
    try:
        yield db
    finally:
        db.close()

app.dependency_overrides[get_db] = override_get_db
client = TestClient(app)

def test_create_product():
    response = client.post('/products/', json={"product_id": 1, "name": "Test name", "description": "Test description", "category": "Test category"})
    assert response.status_code == 201
    data = response.json()
    assert "id" in data

def test_list_products():
    client.post('/products/', json={"product_id": 1, "name": "Test name", "description": "Test description", "category": "Test category"})
    response = client.get('/products/')
    assert response.status_code == 200
    assert len(response.json()) >= 1

def test_get_product_by_id():
    created = client.post('/products/', json={"product_id": 1, "name": "Test name", "description": "Test description", "category": "Test category"}).json()
    item_id = created['id']
    response = client.get(f'/products/{item_id}')
    assert response.status_code == 200
    assert response.json()['id'] == item_id

def test_get_product_not_found():
    response = client.get('/products/99999')
    assert response.status_code == 404

def test_update_product():
    created = client.post('/products/', json={"product_id": 1, "name": "Test name", "description": "Test description", "category": "Test category"}).json()
    item_id = created['id']
    response = client.put(f'/products/{item_id}', json={"product_id": 1, "name": "Updated name", "description": "Test description", "category": "Test category"})
    assert response.status_code == 200

def test_delete_product():
    created = client.post('/products/', json={"product_id": 1, "name": "Test name", "description": "Test description", "category": "Test category"}).json()
    item_id = created['id']
    response = client.delete(f'/products/{item_id}')
    assert response.status_code == 204
    response = client.get(f'/products/{item_id}')
    assert response.status_code == 404

def test_create_storagelocation():
    response = client.post('/storage_locations/', json={"location_id": 1, "name": "Test name", "capacity": 0})
    assert response.status_code == 201
    data = response.json()
    assert "id" in data

def test_list_storagelocations():
    client.post('/storage_locations/', json={"location_id": 1, "name": "Test name", "capacity": 0})
    response = client.get('/storage_locations/')
    assert response.status_code == 200
    assert len(response.json()) >= 1

def test_get_storagelocation_by_id():
    created = client.post('/storage_locations/', json={"location_id": 1, "name": "Test name", "capacity": 0}).json()
    item_id = created['id']
    response = client.get(f'/storage_locations/{item_id}')
    assert response.status_code == 200
    assert response.json()['id'] == item_id

def test_get_storagelocation_not_found():
    response = client.get('/storage_locations/99999')
    assert response.status_code == 404

def test_update_storagelocation():
    created = client.post('/storage_locations/', json={"location_id": 1, "name": "Test name", "capacity": 0}).json()
    item_id = created['id']
    response = client.put(f'/storage_locations/{item_id}', json={"location_id": 1, "name": "Updated name", "capacity": 0})
    assert response.status_code == 200

def test_delete_storagelocation():
    created = client.post('/storage_locations/', json={"location_id": 1, "name": "Test name", "capacity": 0}).json()
    item_id = created['id']
    response = client.delete(f'/storage_locations/{item_id}')
    assert response.status_code == 204
    response = client.get(f'/storage_locations/{item_id}')
    assert response.status_code == 404

def test_create_transfer():
    response = client.post('/transfers/', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0})
    assert response.status_code == 201
    data = response.json()
    assert "id" in data

def test_list_transfers():
    client.post('/transfers/', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0})
    response = client.get('/transfers/')
    assert response.status_code == 200
    assert len(response.json()) >= 1

def test_get_transfer_by_id():
    created = client.post('/transfers/', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0}).json()
    item_id = created['id']
    response = client.get(f'/transfers/{item_id}')
    assert response.status_code == 200
    assert response.json()['id'] == item_id

def test_get_transfer_not_found():
    response = client.get('/transfers/99999')
    assert response.status_code == 404

def test_update_transfer():
    created = client.post('/transfers/', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0}).json()
    item_id = created['id']
    response = client.put(f'/transfers/{item_id}', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0})
    assert response.status_code == 200

def test_delete_transfer():
    created = client.post('/transfers/', json={"transfer_id": 1, "product_id": 1, "from_location_id": 1, "to_location_id": 1, "quantity": 0}).json()
    item_id = created['id']
    response = client.delete(f'/transfers/{item_id}')
    assert response.status_code == 204
    response = client.get(f'/transfers/{item_id}')
    assert response.status_code == 404